Quote:
Originally Posted by DannoXYZ
compression test
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Thanks; I finally got around to doing this (been a crazy busy last few weeks, sadly). Here are my results (all in PSI):
Without Oil:
Left Cylinder: 70, 70, 70
Right Cylinder: 70, 70, 70
With Oil:
Left Cylinder: 80, 78, 76
Right Cylinder: 70, 72, 72
I know this is
way too low to even get this to run, and I guess I'll be focusing on the engine next. What should I be considering next? Piston rings? My methods are below if you want to check my work (note about valve adjustments at the end).
Methods:
All done with the throttle held fully opened, battery fully charged beforehand, valves adjusted, and cranking for 8-10 seconds while also watching to ensure the max compression value was reached. When testing a cylinder, I left the other spark plug in (ex: if testing the left cylinder, the right spark plug was still in). Each test was done without oil and then with oil three times on each cylinder. I also checked to make sure there were no leaks between the carbs and airbox/engine. I used the "PITTSBURGH AUTOMOTIVEQuick-Connect Compression Tester" from Harbor Freight (is it possible this is what gave me low values?).
Valve Adjustment Note: I triple-checked (after finishing all my adjustments) my valves to ensure that the intake valves were .08 - .13mm and the exhaust valves were .11 - .16mm. Every time I adjusted one, I ended up checking them all, so I'm pretty confident that the valves should be to spec.